Interstate names

[pnorman]

linear_label.mss contains

#vector_linear_labels::limited_access_hwy {
  ::freeway_text[rclass=0] {
/* label code */
  }
}
/* this layer prevents surface street text from crossing over highways */
#highway_overlay [zoom>=11][rclass=0][ramp!=true] {
/* code to stop labels from placing here */

#vector_linear_labels::surface_features {
/* label code for the rest of the road classes */
}

A previous file contains road shields.
It looks like intent was to display shields, freeway names, and then other names, preventing the other names from rendering across freeways. This is not the effect.

Because highway_overlay comes before vector_linear_labels in the vector tiles, the limited_access_hwy MSS will never render with z>=11 and ramp!=true.

This should be refactored to put all freeway labels before blanking.